The structural and tribological properties of nanocrystalline
electrochemical coatings with nickel matrix, B. Szeptycka, and A.
Gajewska Institute of Precision Mechanics, 3 Duchnicka Street, 01-796
Warsaw
The possibilities of producing of a wear resistant nanocrystalline
composite coatings with nickel matrix were investigated.
Nickel plating bath with low concentration of nickel ions (0.76
mol/dm3), organic compounds, cationic fluorosurfactants and dispersed
particles: SiC in pair with PTFE or CFx and boron were used for
deposition of the nanocrystalline composite electrochemical coatings.
The crystalline growth and preferred orientation of the prepared
deposits were studied by X-ray analysis, while the incorporation
percentage and surface morphology of the composite coatings were
investigated by scanning electron microscopy (SEM) and Energy
Dispersion Spectroscopy (EDS) techniques. The wear behavior was
examined (for Ni-SiC-fluoropolymer coatings) by wheel abrasion test.
Second experiment (for Ni-B coatings) was tested using a technique
based on the measuring system comprising a flat surface and a ball.
The presented results support the conclusion that a nanocrystalline
structure of a nickel layer is not sufficient to obtain good
functional properties. Strengthening the nanocrystalline nickel matrix
with ceramic and polymer particles gave a positive effect in the form
of high wear resistance.

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